You are not looking for JUST a surge protector, you want what most of the manufacturers refer to as a EMS (Electrical Management System) which is somewhat of a misnomer but in any case, they do alot more than just catch surges. They have a relay in them that will close after they check the incoming circuit for crossed wiring (which would be at the pedestal) and they also monitor voltage and only allow voltage between about 105v to about 125v to prevent burning up devices such as A/C units (generally due to low voltage). They will also (usually) monitor and shut off power if the voltage is too high or low after you plug up, and also the cycles (Hz) is out of range.
Here is the text of a post I made on another forum in response to almost the same question about surge suppression/electric management..........
I installed a hardwired Progressive Industries EMS-HW30C in the Winnebago View motor home I had previously. Sold it. Unit worked good, I liked having the display inside that showed the volts, amps, cycles, and previous or current error code. Its gone now, so I gotta do it all over again.
Planning on a portable unit this time, get a new RV, and keep the device, they are too expensive to keep giving away when I sell something.
Considering the Progressive EMS-PT30X. It has the same display built into it, so if you want to see it, you gotta go to the pedestal and look at it. Must hang vertically when in use (not sure why) so the lack of Bluetooth to an app or inside display and the must hang vertically are the Cons of this. Also, the surge suppressor in this unit cannot be replaced by the owner, and must be returned to Progressive. USA made and does display cycles are pluses to me. Other good pluses are a weather cover over the receptacle where the shore cord plugs in. $286 on Amazon, cannot be purchased from Mfg.
Second is the Southwire/Surge Guard 34930 OR 34931. This has all of the bells and
whistles too. It monitors cycles and shuts down if out of range, but does not display the cycles. The 34931 has the optional Bluetooth capability to a display inside the RV (I like that), but apparently no app to use on phone or tablet. No mention of a replaceable surge suppressor, in fact it says the unit should be replaced if you get a surge failure warning. $251 from Amazon, cannot be purchased direct from mfg.
Third is the Hughes PWD-30EPO which does all of the same things as the others, but will Bluetooth to your phone or tablet, no separate display available. I cannot find anything that says it monitors cycles, so not sure on that one. It does have a user replaceable surge suppressor in case yours blows. $255 retail from Hughes. $230 on Amazon.
Progressive features and comparison chart
Southwire/Surge Guard feature and comparison charg, scroll to bottom of page
Hughes features and comparison chart, scroll down the page to near the bottom.
For me, what I would like to have is the Southwire 40430 which is a transfer switch and EMS combined. I have a built in generator, so this would be perfect, but it is something like $600 and no one would talk about discounting it. I think it is an odd beast that may disappear from the market Southwire has not taken any pains to promote it.I am liking the Hughes unit more than the others.
As far as the autoformer goes, it is a step up transformer (Boost) and as such draws more current than it puts out. Many private parks forbid such units as it puts additional loads on their already strained systems. The 2020 version of the National Electric Code says that autotransformers, autoformers, line conditoners, whatever you want to call them, and not allowed to be used in an RV park/campground. There is, of course, no teeth in this unless a local AHJ (Authority Having Jurisdiction) meaning a state, county, city, etc, has adopted that version of the code and incorporated it into defacto law. But, simply put, they are 1) trying to get campgrounds to improve their electric grids, and 2)stop people from causing even worse brownouts by some people using autoformers while others suffer with even lower voltage. I don't have any skin in the game, so it doesn't matter to me, but it is something to think about. Not trying to start an argument, just stating the simple facts as best as I can.
Charles
'03 Ram 2500 CTD, 5.9HO six speed, PacBrake Exh Brake, std cab, long bed, Leer top and 2008 Bigfoot 25B21RB.. previously (both gone) 2008 Thor/Dutchman Freedom Spirit 180 & 2007 Winnebago View 23H Motorhome.